Ground Penetrating Radar (GPR) is a non-invasive method of material analysis based on transmitting an ultra wide band EM signal into the materials. A part of the EM wave is reflected when it reaches a boundary between two materials with different electrical properties. The reflected signal gets recorded at the source of the EM wave and is displayed for the operator and frequently recorded for later analysis. The first commercial GPR systems were developed in the early 1970's mainly for mining applications. During the last 40 years they have evolved greatly, starting as analogue instruments and entering the digital era sometime during the 1990's. Today there are many GPR manufacturers in the world and GPR technology is being used for different applications like geology, mining, archeology, utility detection, road surveying, environmental surveying, construction inspection and many more.

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